Steam-cooker



W. A. DUNCAN.

SEAM COOKER.

APPLICATION FILED AUG. I4. I9I9.

1,33 1,005. Patented Feb. 17, 1920.

j@if I WAYNE A. DUNCAN, OF CHICAGO, ILLINOIS.

STEAM-COOKER.

Specification of Letters Patent.

Patented Feb. 17, 1920.

Application filed August 14, 1919. Serial No. 317,535.

To all whom t may concern:

Be it known that I, WAYNE A. DnNcAN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Steam- Cookers; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a steam cooker of the type illustrated in my pending application, Serial No. 245,318, filed July 17, 1918, and particularly to the door construction thereof.

The primary object of the invention resides in the provision of a door .which will, when in its closed position, prevent the escape of steam or heat from the cooking compartment, and yet one which may be l readily opened and closed in the minimum time.

In the drawing: Figure 1 is an elevation of my invention; Fig. 2 is a fragmental section thereof; and Fig. 3 is a fragmental elevation. a

A portion of the cooking chamber is illustrated and this comprises inner and outer shells 5 and 6, the edge 7 of the outer shell 6 at the door opening extending beyond the edge 8: of the inner shell 5 for a purpose which will later appear. -A channel member 9 extends completely around the door opening and is secured to the edges 7 and of the shells 5 and 6 by turned over portions 10 and 11. This channel member is backed up by a reinforcing member 12, preferably of bar metal, which is disposed between the shells 5 and 6 as illustrated in Fig. 2 of the drawing. A gasket 13 of rubber or other suitable packing materialis disposed in the channel member 9 and because of the difference in extent of the inner and outer shells 5 and 6, a portion of the gasket is exposed at 14.

A sheet metal door 15 is hinged to one side of the outer shell 6 at 16 and is adapted to close against the gasket 13, as illustrated in Fig. 2 of the drawing. The spacing of the inner edge of the channel member 9 from the door results in a free space 17 for the compression of the gasket.

A plurality of plates 18 are secured to the sides of the outer shell and each of these plates is provided with an opening 19 for.

the accommodation of a ball 2O on the end of an arm 21. These balls 2O extend into the space between the shells 5 and 6 and act as pivots for the arms 21. Angular portions 22 are formed on the arms 21 and are adapted to swing to overlie the edges of the door at intervals around the same, as illus trated in Fig. 1.

A thumb screw 23 extends through each angular portion 22 and is adapted to be screwed against the edge of the door to force the same against the gasket 13. The pressure exerted by the screws 23 causes the compression of the gasket and particularly that portion of the gasket located adjacent to the space 17. The result of this local compression is the binding of the gasket, not only against the inner face of the door itself, but also against the side and bottom walls of the channel member.

It will be appreciated that when it is desired to open the door it is only necessary to back oft1 the screws 23 and swing the arms 2l about their pivots to free the door. When the door is swung to its closed position it arbuts against the Gasket 13. The arms 21 are then swung into position and the screws 23 tightened. The tightening of these screws compresses the gaskets 13 and binds the same against the door and the walls of the channel member 9 whereby a toggle joint is formed.

It will be observed that the ball elements 20 bear against one side of the reinforcing elements 12 so that when the thumb screws 23 are tightened there is a direct binding action between the screw and the ball membei', thus relieving the strain on the shells 5 and 6.

What I claim is:

1. In a cooker having inner and outer shells, a channel member mounted at the edges of and between said shells, the inner wall of said channel member being shorter than the outer wall, a compressible gasket mounted in the channel member, the outer face of the gasket extending slightly beyond the edge of the outer wall of the channel member, a door hinged on the outer shell, and means adapted to c xert pressure on the door at points between the inner and outer walls of the channel member.

2. In a cooker having inner and outer shells, a channel member mounted at the edges of and between the said shells, the

iteiidiiig slightly beyond the edge of the outer wall of the channel member, whereby a portion of the gasket extends beyond the edgeof the inner wall, a door hinged to the outer wall and adapted to abut against the outer edge of the channel member, and means adapted to eXert pressure against the gasket between the inner and outer walls .of

the channel member, whereby the gasket isV caused to bind against the door and the walls of the channel member.

In testimony whereof I aix'my signature.

" i WAYNEA. DUNCAN. 

